html - 如何向用户显示在网页中选择了菜单栏的哪个选项

Question

我在网页中有一个 HTML 菜单栏，网页中的所有页面都有它。当我在此菜单栏中选择一个选项时，我希望用户在浏览整个网页时识别用户选择了哪个选项(或者用户所在的页面)。这可以通过更改该特定选项的颜色来识别。菜单栏的代码写在下面，

<style>
/* Stylesheet */
#cssmenu > ul{
    list-style: none;
    margin: 0;
    padding: 0;
    vertical-align: baseline;
    line-height: 1;
}

/* The container */
#cssmenu > ul {
    display: block;
    position: relative;
    width: 150px;
}

    /* The list elements which contain the links */
    #cssmenu > ul li {
        display: block;
        position: relative;
        margin: 0;
        padding: 0;
        width: 150px;   
    }

        /* General link styling */
        #cssmenu > ul li a {
            /* Layout */
            display: block;
            position: relative;
            margin: 0;
            border-top: 1px dotted #fff;
            border-bottom: 1px dotted #d9d9d9;
            padding: 11px 20px;
            width: 110px;

            /* Typography */
            font-family:  Helvetica, Arial, sans-serif;
            color: #3dafea;
            text-decoration: none;
            text-transform: uppercase;
            text-shadow: 0 1px 0 #fff;
            font-size: 13px;
            font-weight: 300;

            /* Background & effects */
            background: #eaeaea;
        }

        /* Rounded corners for the first link of the menu/submenus */
        #cssmenu > ul li:first-child>a {
            border-top-left-radius: 4px;
            border-top-right-radius: 4px;
            border-top: 0;
        }

        /* Rounded corners for the last link of the menu/submenus */
        #cssmenu > ul li:last-child>a {
            border-bottom-left-radius: 4px;
            border-bottom-right-radius: 4px;
            border-bottom: 0;
        }


        /* The hover state of the menu/submenu links */
        #cssmenu > ul li>a:hover, #cssmenu > ul li:hover>a {
            color: #fff;
            text-shadow: 0 1px 0 rgba(0, 0, 0, .3);
            background: #54cdf1;
            background: -webkit-linear-gradient(bottom, #54cdf1, #74d7f3);
            background: -ms-linear-gradient(bottom, #54cdf1, #74d7f3); 
            background: -moz-linear-gradient(bottom, #54cdf1, #74d7f3);
            background: -o-linear-gradient(bottom, #54cdf1, #74d7f3);
            border-color: transparent;
        }

        /* The arrow indicating a submenu */
        #cssmenu > ul .has-sub>a::after {
            content: '';
            position: absolute;
            top: 16px;
            right: 10px;
            width: 0px;
            height: 0px;

            /* Creating the arrow using borders */
            border: 4px solid transparent;
            border-left: 4px solid #3dafea; 
        }

        /* The same arrow, but with a darker color, to create the shadow effect */
        #cssmenu > ul .has-sub>a::before {
            content: '';
            position: absolute;
            top: 17px;
            right: 10px;
            width: 0px;
            height: 0px;

            /* Creating the arrow using borders */
            border: 4px solid transparent;
            border-left: 4px solid #fff;
        }

        /* Changing the color of the arrow on hover */
        #cssmenu > ul li>a:hover::after, #cssmenu > ul li:hover>a::after {
            border-left: 4px solid #fff;
        }

        #cssmenu > ul li>a:hover::before, #cssmenu > ul li:hover>a::before {
            border-left: 4px solid rgba(0, 0, 0, .25);
        }


        /* THE SUBMENUS */
        #cssmenu > ul ul {
            position: absolute;
            left: 150px;
            top: -9999px;
            padding-left: 5px;
            opacity: 0;
            /* The fade effect, created using an opacity transition */
            -webkit-transition: opacity .3s ease-in;
            -moz-transition: opacity .3s ease-in;
            -o-transition: opacity .3s ease-in;
            -ms-transition: opacity .3s ease-in;
        }

        /* Showing the submenu when the user is hovering the parent link */
        #cssmenu > ul li:hover>ul {
            top: 0px;
            opacity: 1;
        }
</style>
 <div id='cssmenu'>
<ul>
<li><a href='#'><span>Home</span></a></li>
<li><a href='#'><span>Products</span></a></li>
<li><a href='#'><span>Menu 1</span></a></li>
<li><a href='#'><span>Menu 2</span></a></li>
<li><a href='#'><span>About</span></a></li>
<li><a href='#'><span>Contact</span></a></li>
</ul>
</div>

有人知道怎么做吗？谢谢。

Answer 1

您无法仅使用 CSS 检测点击，您需要使用一些 JavaScript。这是您的代码，添加了一些内容以显示选中的内容。

jsFiddle

JavaScript

var menuItems = document.querySelectorAll('#cssmenu li');
for (var i = 0; i < menuItems.length; i++) {
    (function (i) {
        menuItems[i].onclick = function () {
            clearSelection();
            this.className = 'clicked';
        }
    })(i);
}

function clearSelection() {
    for (var i = 0; i < menuItems.length; i++) {
        menuItems[i].className = '';
    }
}

CSS

#cssmenu > ul li.clicked a {
    background:#F00;
}